Convolutional Neural Networks

Project: Write an Algorithm for a Dog Identification App

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In this notebook, some template code has already been provided for you, and you will need to implement additional functionality to successfully complete this project. You will not need to modify the included code beyond what is requested. Sections that begin with '(IMPLEMENTATION)' in the header indicate that the following block of code will require additional functionality which you must provide. Instructions will be provided for each section, and the specifics of the implementation are marked in the code block with a 'TODO' statement. Please be sure to read the instructions carefully!

Note: Once you have completed all of the code implementations, you need to finalize your work by exporting the Jupyter Notebook as an HTML document. Before exporting the notebook to html, all of the code cells need to have been run so that reviewers can see the final implementation and output. You can then export the notebook by using the menu above and navigating to File -> Download as -> HTML (.html). Include the finished document along with this notebook as your submission.

In addition to implementing code, there will be questions that you must answer which relate to the project and your implementation. Each section where you will answer a question is preceded by a 'Question X' header. Carefully read each question and provide thorough answers in the following text boxes that begin with 'Answer:'. Your project submission will be evaluated based on your answers to each of the questions and the implementation you provide.

Note: Code and Markdown cells can be executed using the Shift + Enter keyboard shortcut. Markdown cells can be edited by double-clicking the cell to enter edit mode.

The rubric contains optional "Stand Out Suggestions" for enhancing the project beyond the minimum requirements. If you decide to pursue the "Stand Out Suggestions", you should include the code in this Jupyter notebook.

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Why We're Here

In this notebook, you will make the first steps towards developing an algorithm that could be used as part of a mobile or web app. At the end of this project, your code will accept any user-supplied image as input. If a dog is detected in the image, it will provide an estimate of the dog's breed. If a human is detected, it will provide an estimate of the dog breed that is most resembling. The image below displays potential sample output of your finished project (... but we expect that each student's algorithm will behave differently!).

In this real-world setting, you will need to piece together a series of models to perform different tasks; for instance, the algorithm that detects humans in an image will be different from the CNN that infers dog breed. There are many points of possible failure, and no perfect algorithm exists. Your imperfect solution will nonetheless create a fun user experience!

The Road Ahead

We break the notebook into separate steps. Feel free to use the links below to navigate the notebook.

• Step 0: Import Datasets
• Step 1: Detect Humans
• Step 2: Detect Dogs
• Step 3: Create a CNN to Classify Dog Breeds (from Scratch)
• Step 4: Create a CNN to Classify Dog Breeds (using Transfer Learning)
• Step 5: Write your Algorithm
• Step 6: Test Your Algorithm

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Step 0: Import Datasets

Make sure that you've downloaded the required human and dog datasets:

Note: if you are using the Udacity workspace, you DO NOT need to re-download these - they can be found in the /data folder as noted in the cell below.

• Download the dog dataset. Unzip the folder and place it in this project's home directory, at the location /dog_images.

• Download the human dataset. Unzip the folder and place it in the home directory, at location /lfw.

Note: If you are using a Windows machine, you are encouraged to use 7zip to extract the folder.

In the code cell below, we save the file paths for both the human (LFW) dataset and dog dataset in the numpy arrays human_files and dog_files.

import numpy as np
from glob import glob

# load filenames for human and dog images
human_files = np.array(glob("lfw/*/*"))
dog_files = np.array(glob("dogImages/*/*/*"))

# print number of images in each dataset
print('There are %d total human images.' % len(human_files))
print('There are %d total dog images.' % len(dog_files))

There are 13233 total human images.
There are 8351 total dog images.

Step 1: Detect Humans

In this section, we use OpenCV's implementation of Haar feature-based cascade classifiers to detect human faces in images.

OpenCV provides many pre-trained face detectors, stored as XML files on github. We have downloaded one of these detectors and stored it in the haarcascades directory. In the next code cell, we demonstrate how to use this detector to find human faces in a sample image.

import cv2                
import matplotlib.pyplot as plt                        
%matplotlib inline                               

# extract pre-trained face detector
face_cascade = cv2.CascadeClassifier('haarcascades/haarcascade_frontalface_alt.xml')

# load color (BGR) image
img = cv2.imread(human_files[0])
# convert BGR image to grayscale
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

# find faces in image
faces = face_cascade.detectMultiScale(gray)

# print number of faces detected in the image
print('Number of faces detected:', len(faces))

# get bounding box for each detected face
for (x,y,w,h) in faces:
    # add bounding box to color image
    cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)
    
# convert BGR image to RGB for plotting
cv_rgb = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)

# display the image, along with bounding box
plt.imshow(cv_rgb)
plt.show()

Number of faces detected: 1

Before using any of the face detectors, it is standard procedure to convert the images to grayscale. The detectMultiScale function executes the classifier stored in face_cascade and takes the grayscale image as a parameter.

In the above code, faces is a numpy array of detected faces, where each row corresponds to a detected face. Each detected face is a 1D array with four entries that specifies the bounding box of the detected face. The first two entries in the array (extracted in the above code as x and y) specify the horizontal and vertical positions of the top left corner of the bounding box. The last two entries in the array (extracted here as w and h) specify the width and height of the box.

Write a Human Face Detector

We can use this procedure to write a function that returns True if a human face is detected in an image and False otherwise. This function, aptly named face_detector, takes a string-valued file path to an image as input and appears in the code block below.

# returns "True" if face is detected in image stored at img_path
def face_detector(img_path):
    img = cv2.imread(img_path)
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
    faces = face_cascade.detectMultiScale(gray)
    return len(faces) > 0

(IMPLEMENTATION) Assess the Human Face Detector

Question 1: Use the code cell below to test the performance of the face_detector function.

• What percentage of the first 100 images in human_files have a detected human face?
• What percentage of the first 100 images in dog_files have a detected human face?

Ideally, we would like 100% of human images with a detected face and 0% of dog images with a detected face. You will see that our algorithm falls short of this goal, but still gives acceptable performance. We extract the file paths for the first 100 images from each of the datasets and store them in the numpy arrays human_files_short and dog_files_short.

Answer: (You can print out your results and/or write your percentages in this cell)

from tqdm import tqdm

human_files_short = human_files[:100]
dog_files_short = dog_files[:100]

#-#-# Do NOT modify the code above this line. #-#-#

## TODO: Test the performance of the face_detector algorithm 
## on the images in human_files_short and dog_files_short.

detected_human = 0
detected_dog = 0

for n in human_files_short:
    if face_detector(n):
        detected_human += 1
for n in dog_files_short:
    if face_detector(n):
        detected_dog += 1 
print('Human face detection accuracy: {0}%'.format((detected_human/len(human_files_short)*100)))
print('Dog face detection accuracy: {0}%'.format((detected_dog/len(dog_files_short)*100)))

Human face detection accuracy: 96.0%
Dog face detection accuracy: 18.0%

We suggest the face detector from OpenCV as a potential way to detect human images in your algorithm, but you are free to explore other approaches, especially approaches that make use of deep learning :). Please use the code cell below to design and test your own face detection algorithm. If you decide to pursue this optional task, report performance on human_files_short and dog_files_short.

### (Optional) 
### TODO: Test performance of anotherface detection algorithm.
### Feel free to use as many code cells as needed.

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Step 2: Detect Dogs

In this section, we use a pre-trained model to detect dogs in images.

Obtain Pre-trained VGG-16 Model

The code cell below downloads the VGG-16 model, along with weights that have been trained on ImageNet, a very large, very popular dataset used for image classification and other vision tasks. ImageNet contains over 10 million URLs, each linking to an image containing an object from one of 1000 categories.

import torch
import torchvision.models as models

# define VGG16 model
VGG16 = models.vgg16(pretrained=True)

# check if CUDA is available
use_cuda = torch.cuda.is_available()

# move model to GPU if CUDA is available
if use_cuda:
    VGG16 = VGG16.cuda()

Downloading: "https://download.pytorch.org/models/vgg16-397923af.pth" to C:\Users\z/.cache\torch\hub\checkpoints\vgg16-397923af.pth

Given an image, this pre-trained VGG-16 model returns a prediction (derived from the 1000 possible categories in ImageNet) for the object that is contained in the image.

(IMPLEMENTATION) Making Predictions with a Pre-trained Model

In the next code cell, you will write a function that accepts a path to an image (such as 'dogImages/train/001.Affenpinscher/Affenpinscher_00001.jpg') as input and returns the index corresponding to the ImageNet class that is predicted by the pre-trained VGG-16 model. The output should always be an integer between 0 and 999, inclusive.

Before writing the function, make sure that you take the time to learn how to appropriately pre-process tensors for pre-trained models in the PyTorch documentation.

from PIL import Image
Image.LOAD_TRUNCATED_IMAGES = True
import torchvision.transforms as transforms

def VGG16_predict(img_path):
    '''
    Use pre-trained VGG-16 model to obtain index corresponding to 
    predicted ImageNet class for image at specified path
    
    Args:
        img_path: path to an image
        
    Returns:
        Index corresponding to VGG-16 model's prediction
    '''
    
    ## TODO: Complete the function.
    ## Load and pre-process an image from the given img_path
    ## Return the *index* of the predicted class for that image
    pic = Image.open(img_path).convert('RGB')
    
    preprocess = transforms.Compose([transforms.Resize((224, 224)), \
                                     transforms.ToTensor(), \
                                     transforms.Normalize(mean=[0.485, 0.456, 0.406],\
                                                          std=[0.229, 0.224, 0.225])])
    
    img1 = preprocess(pic)
    if torch.cuda.is_available():
        img1 = img1.unsqueeze(0).cuda()
    else:
        img1 = img1.unsqueeze(0)
    return np.argmax(VGG16(img1).view(-1).detach().cpu().numpy())

print(VGG16_predict('images/Labrador_retriever_06457.jpg'))

208

(IMPLEMENTATION) Write a Dog Detector

While looking at the dictionary, you will notice that the categories corresponding to dogs appear in an uninterrupted sequence and correspond to dictionary keys 151-268, inclusive, to include all categories from 'Chihuahua' to 'Mexican hairless'. Thus, in order to check to see if an image is predicted to contain a dog by the pre-trained VGG-16 model, we need only check if the pre-trained model predicts an index between 151 and 268 (inclusive).

Use these ideas to complete the dog_detector function below, which returns True if a dog is detected in an image (and False if not).

res = {0: 'tench, Tinca tinca',
 1: 'goldfish, Carassius auratus',
 2: 'great white shark, white shark, man-eater, man-eating shark, Carcharodon carcharias',
 3: 'tiger shark, Galeocerdo cuvieri',
 4: 'hammerhead, hammerhead shark',
 5: 'electric ray, crampfish, numbfish, torpedo',
 6: 'stingray',
 7: 'cock',
 8: 'hen',
 9: 'ostrich, Struthio camelus',
 10: 'brambling, Fringilla montifringilla',
 11: 'goldfinch, Carduelis carduelis',
 12: 'house finch, linnet, Carpodacus mexicanus',
 13: 'junco, snowbird',
 14: 'indigo bunting, indigo finch, indigo bird, Passerina cyanea',
 15: 'robin, American robin, Turdus migratorius',
 16: 'bulbul',
 17: 'jay',
 18: 'magpie',
 19: 'chickadee',
 20: 'water ouzel, dipper',
 21: 'kite',
 22: 'bald eagle, American eagle, Haliaeetus leucocephalus',
 23: 'vulture',
 24: 'great grey owl, great gray owl, Strix nebulosa',
 25: 'European fire salamander, Salamandra salamandra',
 26: 'common newt, Triturus vulgaris',
 27: 'eft',
 28: 'spotted salamander, Ambystoma maculatum',
 29: 'axolotl, mud puppy, Ambystoma mexicanum',
 30: 'bullfrog, Rana catesbeiana',
 31: 'tree frog, tree-frog',
 32: 'tailed frog, bell toad, ribbed toad, tailed toad, Ascaphus trui',
 33: 'loggerhead, loggerhead turtle, Caretta caretta',
 34: 'leatherback turtle, leatherback, leathery turtle, Dermochelys coriacea',
 35: 'mud turtle',
 36: 'terrapin',
 37: 'box turtle, box tortoise',
 38: 'banded gecko',
 39: 'common iguana, iguana, Iguana iguana',
 40: 'American chameleon, anole, Anolis carolinensis',
 41: 'whiptail, whiptail lizard',
 42: 'agama',
 43: 'frilled lizard, Chlamydosaurus kingi',
 44: 'alligator lizard',
 45: 'Gila monster, Heloderma suspectum',
 46: 'green lizard, Lacerta viridis',
 47: 'African chameleon, Chamaeleo chamaeleon',
 48: 'Komodo dragon, Komodo lizard, dragon lizard, giant lizard, Varanus komodoensis',
 49: 'African crocodile, Nile crocodile, Crocodylus niloticus',
 50: 'American alligator, Alligator mississipiensis',
 51: 'triceratops',
 52: 'thunder snake, worm snake, Carphophis amoenus',
 53: 'ringneck snake, ring-necked snake, ring snake',
 54: 'hognose snake, puff adder, sand viper',
 55: 'green snake, grass snake',
 56: 'king snake, kingsnake',
 57: 'garter snake, grass snake',
 58: 'water snake',
 59: 'vine snake',
 60: 'night snake, Hypsiglena torquata',
 61: 'boa constrictor, Constrictor constrictor',
 62: 'rock python, rock snake, Python sebae',
 63: 'Indian cobra, Naja naja',
 64: 'green mamba',
 65: 'sea snake',
 66: 'horned viper, cerastes, sand viper, horned asp, Cerastes cornutus',
 67: 'diamondback, diamondback rattlesnake, Crotalus adamanteus',
 68: 'sidewinder, horned rattlesnake, Crotalus cerastes',
 69: 'trilobite',
 70: 'harvestman, daddy longlegs, Phalangium opilio',
 71: 'scorpion',
 72: 'black and gold garden spider, Argiope aurantia',
 73: 'barn spider, Araneus cavaticus',
 74: 'garden spider, Aranea diademata',
 75: 'black widow, Latrodectus mactans',
 76: 'tarantula',
 77: 'wolf spider, hunting spider',
 78: 'tick',
 79: 'centipede',
 80: 'black grouse',
 81: 'ptarmigan',
 82: 'ruffed grouse, partridge, Bonasa umbellus',
 83: 'prairie chicken, prairie grouse, prairie fowl',
 84: 'peacock',
 85: 'quail',
 86: 'partridge',
 87: 'African grey, African gray, Psittacus erithacus',
 88: 'macaw',
 89: 'sulphur-crested cockatoo, Kakatoe galerita, Cacatua galerita',
 90: 'lorikeet',
 91: 'coucal',
 92: 'bee eater',
 93: 'hornbill',
 94: 'hummingbird',
 95: 'jacamar',
 96: 'toucan',
 97: 'drake',
 98: 'red-breasted merganser, Mergus serrator',
 99: 'goose',
 100: 'black swan, Cygnus atratus',
 101: 'tusker',
 102: 'echidna, spiny anteater, anteater',
 103: 'platypus, duckbill, duckbilled platypus, duck-billed platypus, Ornithorhynchus anatinus',
 104: 'wallaby, brush kangaroo',
 105: 'koala, koala bear, kangaroo bear, native bear, Phascolarctos cinereus',
 106: 'wombat',
 107: 'jellyfish',
 108: 'sea anemone, anemone',
 109: 'brain coral',
 110: 'flatworm, platyhelminth',
 111: 'nematode, nematode worm, roundworm',
 112: 'conch',
 113: 'snail',
 114: 'slug',
 115: 'sea slug, nudibranch',
 116: 'chiton, coat-of-mail shell, sea cradle, polyplacophore',
 117: 'chambered nautilus, pearly nautilus, nautilus',
 118: 'Dungeness crab, Cancer magister',
 119: 'rock crab, Cancer irroratus',
 120: 'fiddler crab',
 121: 'king crab, Alaska crab, Alaskan king crab, Alaska king crab, Paralithodes camtschatica',
 122: 'American lobster, Northern lobster, Maine lobster, Homarus americanus',
 123: 'spiny lobster, langouste, rock lobster, crawfish, crayfish, sea crawfish',
 124: 'crayfish, crawfish, crawdad, crawdaddy',
 125: 'hermit crab',
 126: 'isopod',
 127: 'white stork, Ciconia ciconia',
 128: 'black stork, Ciconia nigra',
 129: 'spoonbill',
 130: 'flamingo',
 131: 'little blue heron, Egretta caerulea',
 132: 'American egret, great white heron, Egretta albus',
 133: 'bittern',
 134: 'crane',
 135: 'limpkin, Aramus pictus',
 136: 'European gallinule, Porphyrio porphyrio',
 137: 'American coot, marsh hen, mud hen, water hen, Fulica americana',
 138: 'bustard',
 139: 'ruddy turnstone, Arenaria interpres',
 140: 'red-backed sandpiper, dunlin, Erolia alpina',
 141: 'redshank, Tringa totanus',
 142: 'dowitcher',
 143: 'oystercatcher, oyster catcher',
 144: 'pelican',
 145: 'king penguin, Aptenodytes patagonica',
 146: 'albatross, mollymawk',
 147: 'grey whale, gray whale, devilfish, Eschrichtius gibbosus, Eschrichtius robustus',
 148: 'killer whale, killer, orca, grampus, sea wolf, Orcinus orca',
 149: 'dugong, Dugong dugon',
 150: 'sea lion',
 151: 'Chihuahua',
 152: 'Japanese spaniel',
 153: 'Maltese dog, Maltese terrier, Maltese',
 154: 'Pekinese, Pekingese, Peke',
 155: 'Shih-Tzu',
 156: 'Blenheim spaniel',
 157: 'papillon',
 158: 'toy terrier',
 159: 'Rhodesian ridgeback',
 160: 'Afghan hound, Afghan',
 161: 'basset, basset hound',
 162: 'beagle',
 163: 'bloodhound, sleuthhound',
 164: 'bluetick',
 165: 'black-and-tan coonhound',
 166: 'Walker hound, Walker foxhound',
 167: 'English foxhound',
 168: 'redbone',
 169: 'borzoi, Russian wolfhound',
 170: 'Irish wolfhound',
 171: 'Italian greyhound',
 172: 'whippet',
 173: 'Ibizan hound, Ibizan Podenco',
 174: 'Norwegian elkhound, elkhound',
 175: 'otterhound, otter hound',
 176: 'Saluki, gazelle hound',
 177: 'Scottish deerhound, deerhound',
 178: 'Weimaraner',
 179: 'Staffordshire bullterrier, Staffordshire bull terrier',
 180: 'American Staffordshire terrier, Staffordshire terrier, American pit bull terrier, pit bull terrier',
 181: 'Bedlington terrier',
 182: 'Border terrier',
 183: 'Kerry blue terrier',
 184: 'Irish terrier',
 185: 'Norfolk terrier',
 186: 'Norwich terrier',
 187: 'Yorkshire terrier',
 188: 'wire-haired fox terrier',
 189: 'Lakeland terrier',
 190: 'Sealyham terrier, Sealyham',
 191: 'Airedale, Airedale terrier',
 192: 'cairn, cairn terrier',
 193: 'Australian terrier',
 194: 'Dandie Dinmont, Dandie Dinmont terrier',
 195: 'Boston bull, Boston terrier',
 196: 'miniature schnauzer',
 197: 'giant schnauzer',
 198: 'standard schnauzer',
 199: 'Scotch terrier, Scottish terrier, Scottie',
 200: 'Tibetan terrier, chrysanthemum dog',
 201: 'silky terrier, Sydney silky',
 202: 'soft-coated wheaten terrier',
 203: 'West Highland white terrier',
 204: 'Lhasa, Lhasa apso',
 205: 'flat-coated retriever',
 206: 'curly-coated retriever',
 207: 'golden retriever',
 208: 'Labrador retriever',
 209: 'Chesapeake Bay retriever',
 210: 'German short-haired pointer',
 211: 'vizsla, Hungarian pointer',
 212: 'English setter',
 213: 'Irish setter, red setter',
 214: 'Gordon setter',
 215: 'Brittany spaniel',
 216: 'clumber, clumber spaniel',
 217: 'English springer, English springer spaniel',
 218: 'Welsh springer spaniel',
 219: 'cocker spaniel, English cocker spaniel, cocker',
 220: 'Sussex spaniel',
 221: 'Irish water spaniel',
 222: 'kuvasz',
 223: 'schipperke',
 224: 'groenendael',
 225: 'malinois',
 226: 'briard',
 227: 'kelpie',
 228: 'komondor',
 229: 'Old English sheepdog, bobtail',
 230: 'Shetland sheepdog, Shetland sheep dog, Shetland',
 231: 'collie',
 232: 'Border collie',
 233: 'Bouvier des Flandres, Bouviers des Flandres',
 234: 'Rottweiler',
 235: 'German shepherd, German shepherd dog, German police dog, alsatian',
 236: 'Doberman, Doberman pinscher',
 237: 'miniature pinscher',
 238: 'Greater Swiss Mountain dog',
 239: 'Bernese mountain dog',
 240: 'Appenzeller',
 241: 'EntleBucher',
 242: 'boxer',
 243: 'bull mastiff',
 244: 'Tibetan mastiff',
 245: 'French bulldog',
 246: 'Great Dane',
 247: 'Saint Bernard, St Bernard',
 248: 'Eskimo dog, husky',
 249: 'malamute, malemute, Alaskan malamute',
 250: 'Siberian husky',
 251: 'dalmatian, coach dog, carriage dog',
 252: 'affenpinscher, monkey pinscher, monkey dog',
 253: 'basenji',
 254: 'pug, pug-dog',
 255: 'Leonberg',
 256: 'Newfoundland, Newfoundland dog',
 257: 'Great Pyrenees',
 258: 'Samoyed, Samoyede',
 259: 'Pomeranian',
 260: 'chow, chow chow',
 261: 'keeshond',
 262: 'Brabancon griffon',
 263: 'Pembroke, Pembroke Welsh corgi',
 264: 'Cardigan, Cardigan Welsh corgi',
 265: 'toy poodle',
 266: 'miniature poodle',
 267: 'standard poodle',
 268: 'Mexican hairless',
 269: 'timber wolf, grey wolf, gray wolf, Canis lupus',
 270: 'white wolf, Arctic wolf, Canis lupus tundrarum',
 271: 'red wolf, maned wolf, Canis rufus, Canis niger',
 272: 'coyote, prairie wolf, brush wolf, Canis latrans',
 273: 'dingo, warrigal, warragal, Canis dingo',
 274: 'dhole, Cuon alpinus',
 275: 'African hunting dog, hyena dog, Cape hunting dog, Lycaon pictus',
 276: 'hyena, hyaena',
 277: 'red fox, Vulpes vulpes',
 278: 'kit fox, Vulpes macrotis',
 279: 'Arctic fox, white fox, Alopex lagopus',
 280: 'grey fox, gray fox, Urocyon cinereoargenteus',
 281: 'tabby, tabby cat',
 282: 'tiger cat',
 283: 'Persian cat',
 284: 'Siamese cat, Siamese',
 285: 'Egyptian cat',
 286: 'cougar, puma, catamount, mountain lion, painter, panther, Felis concolor',
 287: 'lynx, catamount',
 288: 'leopard, Panthera pardus',
 289: 'snow leopard, ounce, Panthera uncia',
 290: 'jaguar, panther, Panthera onca, Felis onca',
 291: 'lion, king of beasts, Panthera leo',
 292: 'tiger, Panthera tigris',
 293: 'cheetah, chetah, Acinonyx jubatus',
 294: 'brown bear, bruin, Ursus arctos',
 295: 'American black bear, black bear, Ursus americanus, Euarctos americanus',
 296: 'ice bear, polar bear, Ursus Maritimus, Thalarctos maritimus',
 297: 'sloth bear, Melursus ursinus, Ursus ursinus',
 298: 'mongoose',
 299: 'meerkat, mierkat',
 300: 'tiger beetle',
 301: 'ladybug, ladybeetle, lady beetle, ladybird, ladybird beetle',
 302: 'ground beetle, carabid beetle',
 303: 'long-horned beetle, longicorn, longicorn beetle',
 304: 'leaf beetle, chrysomelid',
 305: 'dung beetle',
 306: 'rhinoceros beetle',
 307: 'weevil',
 308: 'fly',
 309: 'bee',
 310: 'ant, emmet, pismire',
 311: 'grasshopper, hopper',
 312: 'cricket',
 313: 'walking stick, walkingstick, stick insect',
 314: 'cockroach, roach',
 315: 'mantis, mantid',
 316: 'cicada, cicala',
 317: 'leafhopper',
 318: 'lacewing, lacewing fly',
 319: "dragonfly, darning needle, devil's darning needle, sewing needle, snake feeder, snake doctor, mosquito hawk, skeeter hawk",
 320: 'damselfly',
 321: 'admiral',
 322: 'ringlet, ringlet butterfly',
 323: 'monarch, monarch butterfly, milkweed butterfly, Danaus plexippus',
 324: 'cabbage butterfly',
 325: 'sulphur butterfly, sulfur butterfly',
 326: 'lycaenid, lycaenid butterfly',
 327: 'starfish, sea star',
 328: 'sea urchin',
 329: 'sea cucumber, holothurian',
 330: 'wood rabbit, cottontail, cottontail rabbit',
 331: 'hare',
 332: 'Angora, Angora rabbit',
 333: 'hamster',
 334: 'porcupine, hedgehog',
 335: 'fox squirrel, eastern fox squirrel, Sciurus niger',
 336: 'marmot',
 337: 'beaver',
 338: 'guinea pig, Cavia cobaya',
 339: 'sorrel',
 340: 'zebra',
 341: 'hog, pig, grunter, squealer, Sus scrofa',
 342: 'wild boar, boar, Sus scrofa',
 343: 'warthog',
 344: 'hippopotamus, hippo, river horse, Hippopotamus amphibius',
 345: 'ox',
 346: 'water buffalo, water ox, Asiatic buffalo, Bubalus bubalis',
 347: 'bison',
 348: 'ram, tup',
 349: 'bighorn, bighorn sheep, cimarron, Rocky Mountain bighorn, Rocky Mountain sheep, Ovis canadensis',
 350: 'ibex, Capra ibex',
 351: 'hartebeest',
 352: 'impala, Aepyceros melampus',
 353: 'gazelle',
 354: 'Arabian camel, dromedary, Camelus dromedarius',
 355: 'llama',
 356: 'weasel',
 357: 'mink',
 358: 'polecat, fitch, foulmart, foumart, Mustela putorius',
 359: 'black-footed ferret, ferret, Mustela nigripes',
 360: 'otter',
 361: 'skunk, polecat, wood pussy',
 362: 'badger',
 363: 'armadillo',
 364: 'three-toed sloth, ai, Bradypus tridactylus',
 365: 'orangutan, orang, orangutang, Pongo pygmaeus',
 366: 'gorilla, Gorilla gorilla',
 367: 'chimpanzee, chimp, Pan troglodytes',
 368: 'gibbon, Hylobates lar',
 369: 'siamang, Hylobates syndactylus, Symphalangus syndactylus',
 370: 'guenon, guenon monkey',
 371: 'patas, hussar monkey, Erythrocebus patas',
 372: 'baboon',
 373: 'macaque',
 374: 'langur',
 375: 'colobus, colobus monkey',
 376: 'proboscis monkey, Nasalis larvatus',
 377: 'marmoset',
 378: 'capuchin, ringtail, Cebus capucinus',
 379: 'howler monkey, howler',
 380: 'titi, titi monkey',
 381: 'spider monkey, Ateles geoffroyi',
 382: 'squirrel monkey, Saimiri sciureus',
 383: 'Madagascar cat, ring-tailed lemur, Lemur catta',
 384: 'indri, indris, Indri indri, Indri brevicaudatus',
 385: 'Indian elephant, Elephas maximus',
 386: 'African elephant, Loxodonta africana',
 387: 'lesser panda, red panda, panda, bear cat, cat bear, Ailurus fulgens',
 388: 'giant panda, panda, panda bear, coon bear, Ailuropoda melanoleuca',
 389: 'barracouta, snoek',
 390: 'eel',
 391: 'coho, cohoe, coho salmon, blue jack, silver salmon, Oncorhynchus kisutch',
 392: 'rock beauty, Holocanthus tricolor',
 393: 'anemone fish',
 394: 'sturgeon',
 395: 'gar, garfish, garpike, billfish, Lepisosteus osseus',
 396: 'lionfish',
 397: 'puffer, pufferfish, blowfish, globefish',
 398: 'abacus',
 399: 'abaya',
 400: "academic gown, academic robe, judge's robe",
 401: 'accordion, piano accordion, squeeze box',
 402: 'acoustic guitar',
 403: 'aircraft carrier, carrier, flattop, attack aircraft carrier',
 404: 'airliner',
 405: 'airship, dirigible',
 406: 'altar',
 407: 'ambulance',
 408: 'amphibian, amphibious vehicle',
 409: 'analog clock',
 410: 'apiary, bee house',
 411: 'apron',
 412: 'ashcan, trash can, garbage can, wastebin, ash bin, ash-bin, ashbin, dustbin, trash barrel, trash bin',
 413: 'assault rifle, assault gun',
 414: 'backpack, back pack, knapsack, packsack, rucksack, haversack',
 415: 'bakery, bakeshop, bakehouse',
 416: 'balance beam, beam',
 417: 'balloon',
 418: 'ballpoint, ballpoint pen, ballpen, Biro',
 419: 'Band Aid',
 420: 'banjo',
 421: 'bannister, banister, balustrade, balusters, handrail',
 422: 'barbell',
 423: 'barber chair',
 424: 'barbershop',
 425: 'barn',
 426: 'barometer',
 427: 'barrel, cask',
 428: 'barrow, garden cart, lawn cart, wheelbarrow',
 429: 'baseball',
 430: 'basketball',
 431: 'bassinet',
 432: 'bassoon',
 433: 'bathing cap, swimming cap',
 434: 'bath towel',
 435: 'bathtub, bathing tub, bath, tub',
 436: 'beach wagon, station wagon, wagon, estate car, beach waggon, station waggon, waggon',
 437: 'beacon, lighthouse, beacon light, pharos',
 438: 'beaker',
 439: 'bearskin, busby, shako',
 440: 'beer bottle',
 441: 'beer glass',
 442: 'bell cote, bell cot',
 443: 'bib',
 444: 'bicycle-built-for-two, tandem bicycle, tandem',
 445: 'bikini, two-piece',
 446: 'binder, ring-binder',
 447: 'binoculars, field glasses, opera glasses',
 448: 'birdhouse',
 449: 'boathouse',
 450: 'bobsled, bobsleigh, bob',
 451: 'bolo tie, bolo, bola tie, bola',
 452: 'bonnet, poke bonnet',
 453: 'bookcase',
 454: 'bookshop, bookstore, bookstall',
 455: 'bottlecap',
 456: 'bow',
 457: 'bow tie, bow-tie, bowtie',
 458: 'brass, memorial tablet, plaque',
 459: 'brassiere, bra, bandeau',
 460: 'breakwater, groin, groyne, mole, bulwark, seawall, jetty',
 461: 'breastplate, aegis, egis',
 462: 'broom',
 463: 'bucket, pail',
 464: 'buckle',
 465: 'bulletproof vest',
 466: 'bullet train, bullet',
 467: 'butcher shop, meat market',
 468: 'cab, hack, taxi, taxicab',
 469: 'caldron, cauldron',
 470: 'candle, taper, wax light',
 471: 'cannon',
 472: 'canoe',
 473: 'can opener, tin opener',
 474: 'cardigan',
 475: 'car mirror',
 476: 'carousel, carrousel, merry-go-round, roundabout, whirligig',
 477: "carpenter's kit, tool kit",
 478: 'carton',
 479: 'car wheel',
 480: 'cash machine, cash dispenser, automated teller machine, automatic teller machine, automated teller, automatic teller, ATM',
 481: 'cassette',
 482: 'cassette player',
 483: 'castle',
 484: 'catamaran',
 485: 'CD player',
 486: 'cello, violoncello',
 487: 'cellular telephone, cellular phone, cellphone, cell, mobile phone',
 488: 'chain',
 489: 'chainlink fence',
 490: 'chain mail, ring mail, mail, chain armor, chain armour, ring armor, ring armour',
 491: 'chain saw, chainsaw',
 492: 'chest',
 493: 'chiffonier, commode',
 494: 'chime, bell, gong',
 495: 'china cabinet, china closet',
 496: 'Christmas stocking',
 497: 'church, church building',
 498: 'cinema, movie theater, movie theatre, movie house, picture palace',
 499: 'cleaver, meat cleaver, chopper',
 500: 'cliff dwelling',
 501: 'cloak',
 502: 'clog, geta, patten, sabot',
 503: 'cocktail shaker',
 504: 'coffee mug',
 505: 'coffeepot',
 506: 'coil, spiral, volute, whorl, helix',
 507: 'combination lock',
 508: 'computer keyboard, keypad',
 509: 'confectionery, confectionary, candy store',
 510: 'container ship, containership, container vessel',
 511: 'convertible',
 512: 'corkscrew, bottle screw',
 513: 'cornet, horn, trumpet, trump',
 514: 'cowboy boot',
 515: 'cowboy hat, ten-gallon hat',
 516: 'cradle',
 517: 'crane',
 518: 'crash helmet',
 519: 'crate',
 520: 'crib, cot',
 521: 'Crock Pot',
 522: 'croquet ball',
 523: 'crutch',
 524: 'cuirass',
 525: 'dam, dike, dyke',
 526: 'desk',
 527: 'desktop computer',
 528: 'dial telephone, dial phone',
 529: 'diaper, nappy, napkin',
 530: 'digital clock',
 531: 'digital watch',
 532: 'dining table, board',
 533: 'dishrag, dishcloth',
 534: 'dishwasher, dish washer, dishwashing machine',
 535: 'disk brake, disc brake',
 536: 'dock, dockage, docking facility',
 537: 'dogsled, dog sled, dog sleigh',
 538: 'dome',
 539: 'doormat, welcome mat',
 540: 'drilling platform, offshore rig',
 541: 'drum, membranophone, tympan',
 542: 'drumstick',
 543: 'dumbbell',
 544: 'Dutch oven',
 545: 'electric fan, blower',
 546: 'electric guitar',
 547: 'electric locomotive',
 548: 'entertainment center',
 549: 'envelope',
 550: 'espresso maker',
 551: 'face powder',
 552: 'feather boa, boa',
 553: 'file, file cabinet, filing cabinet',
 554: 'fireboat',
 555: 'fire engine, fire truck',
 556: 'fire screen, fireguard',
 557: 'flagpole, flagstaff',
 558: 'flute, transverse flute',
 559: 'folding chair',
 560: 'football helmet',
 561: 'forklift',
 562: 'fountain',
 563: 'fountain pen',
 564: 'four-poster',
 565: 'freight car',
 566: 'French horn, horn',
 567: 'frying pan, frypan, skillet',
 568: 'fur coat',
 569: 'garbage truck, dustcart',
 570: 'gasmask, respirator, gas helmet',
 571: 'gas pump, gasoline pump, petrol pump, island dispenser',
 572: 'goblet',
 573: 'go-kart',
 574: 'golf ball',
 575: 'golfcart, golf cart',
 576: 'gondola',
 577: 'gong, tam-tam',
 578: 'gown',
 579: 'grand piano, grand',
 580: 'greenhouse, nursery, glasshouse',
 581: 'grille, radiator grille',
 582: 'grocery store, grocery, food market, market',
 583: 'guillotine',
 584: 'hair slide',
 585: 'hair spray',
 586: 'half track',
 587: 'hammer',
 588: 'hamper',
 589: 'hand blower, blow dryer, blow drier, hair dryer, hair drier',
 590: 'hand-held computer, hand-held microcomputer',
 591: 'handkerchief, hankie, hanky, hankey',
 592: 'hard disc, hard disk, fixed disk',
 593: 'harmonica, mouth organ, harp, mouth harp',
 594: 'harp',
 595: 'harvester, reaper',
 596: 'hatchet',
 597: 'holster',
 598: 'home theater, home theatre',
 599: 'honeycomb',
 600: 'hook, claw',
 601: 'hoopskirt, crinoline',
 602: 'horizontal bar, high bar',
 603: 'horse cart, horse-cart',
 604: 'hourglass',
 605: 'iPod',
 606: 'iron, smoothing iron',
 607: "jack-o'-lantern",
 608: 'jean, blue jean, denim',
 609: 'jeep, landrover',
 610: 'jersey, T-shirt, tee shirt',
 611: 'jigsaw puzzle',
 612: 'jinrikisha, ricksha, rickshaw',
 613: 'joystick',
 614: 'kimono',
 615: 'knee pad',
 616: 'knot',
 617: 'lab coat, laboratory coat',
 618: 'ladle',
 619: 'lampshade, lamp shade',
 620: 'laptop, laptop computer',
 621: 'lawn mower, mower',
 622: 'lens cap, lens cover',
 623: 'letter opener, paper knife, paperknife',
 624: 'library',
 625: 'lifeboat',
 626: 'lighter, light, igniter, ignitor',
 627: 'limousine, limo',
 628: 'liner, ocean liner',
 629: 'lipstick, lip rouge',
 630: 'Loafer',
 631: 'lotion',
 632: 'loudspeaker, speaker, speaker unit, loudspeaker system, speaker system',
 633: "loupe, jeweler's loupe",
 634: 'lumbermill, sawmill',
 635: 'magnetic compass',
 636: 'mailbag, postbag',
 637: 'mailbox, letter box',
 638: 'maillot',
 639: 'maillot, tank suit',
 640: 'manhole cover',
 641: 'maraca',
 642: 'marimba, xylophone',
 643: 'mask',
 644: 'matchstick',
 645: 'maypole',
 646: 'maze, labyrinth',
 647: 'measuring cup',
 648: 'medicine chest, medicine cabinet',
 649: 'megalith, megalithic structure',
 650: 'microphone, mike',
 651: 'microwave, microwave oven',
 652: 'military uniform',
 653: 'milk can',
 654: 'minibus',
 655: 'miniskirt, mini',
 656: 'minivan',
 657: 'missile',
 658: 'mitten',
 659: 'mixing bowl',
 660: 'mobile home, manufactured home',
 661: 'Model T',
 662: 'modem',
 663: 'monastery',
 664: 'monitor',
 665: 'moped',
 666: 'mortar',
 667: 'mortarboard',
 668: 'mosque',
 669: 'mosquito net',
 670: 'motor scooter, scooter',
 671: 'mountain bike, all-terrain bike, off-roader',
 672: 'mountain tent',
 673: 'mouse, computer mouse',
 674: 'mousetrap',
 675: 'moving van',
 676: 'muzzle',
 677: 'nail',
 678: 'neck brace',
 679: 'necklace',
 680: 'nipple',
 681: 'notebook, notebook computer',
 682: 'obelisk',
 683: 'oboe, hautboy, hautbois',
 684: 'ocarina, sweet potato',
 685: 'odometer, hodometer, mileometer, milometer',
 686: 'oil filter',
 687: 'organ, pipe organ',
 688: 'oscilloscope, scope, cathode-ray oscilloscope, CRO',
 689: 'overskirt',
 690: 'oxcart',
 691: 'oxygen mask',
 692: 'packet',
 693: 'paddle, boat paddle',
 694: 'paddlewheel, paddle wheel',
 695: 'padlock',
 696: 'paintbrush',
 697: "pajama, pyjama, pj's, jammies",
 698: 'palace',
 699: 'panpipe, pandean pipe, syrinx',
 700: 'paper towel',
 701: 'parachute, chute',
 702: 'parallel bars, bars',
 703: 'park bench',
 704: 'parking meter',
 705: 'passenger car, coach, carriage',
 706: 'patio, terrace',
 707: 'pay-phone, pay-station',
 708: 'pedestal, plinth, footstall',
 709: 'pencil box, pencil case',
 710: 'pencil sharpener',
 711: 'perfume, essence',
 712: 'Petri dish',
 713: 'photocopier',
 714: 'pick, plectrum, plectron',
 715: 'pickelhaube',
 716: 'picket fence, paling',
 717: 'pickup, pickup truck',
 718: 'pier',
 719: 'piggy bank, penny bank',
 720: 'pill bottle',
 721: 'pillow',
 722: 'ping-pong ball',
 723: 'pinwheel',
 724: 'pirate, pirate ship',
 725: 'pitcher, ewer',
 726: "plane, carpenter's plane, woodworking plane",
 727: 'planetarium',
 728: 'plastic bag',
 729: 'plate rack',
 730: 'plow, plough',
 731: "plunger, plumber's helper",
 732: 'Polaroid camera, Polaroid Land camera',
 733: 'pole',
 734: 'police van, police wagon, paddy wagon, patrol wagon, wagon, black Maria',
 735: 'poncho',
 736: 'pool table, billiard table, snooker table',
 737: 'pop bottle, soda bottle',
 738: 'pot, flowerpot',
 739: "potter's wheel",
 740: 'power drill',
 741: 'prayer rug, prayer mat',
 742: 'printer',
 743: 'prison, prison house',
 744: 'projectile, missile',
 745: 'projector',
 746: 'puck, hockey puck',
 747: 'punching bag, punch bag, punching ball, punchball',
 748: 'purse',
 749: 'quill, quill pen',
 750: 'quilt, comforter, comfort, puff',
 751: 'racer, race car, racing car',
 752: 'racket, racquet',
 753: 'radiator',
 754: 'radio, wireless',
 755: 'radio telescope, radio reflector',
 756: 'rain barrel',
 757: 'recreational vehicle, RV, R.V.',
 758: 'reel',
 759: 'reflex camera',
 760: 'refrigerator, icebox',
 761: 'remote control, remote',
 762: 'restaurant, eating house, eating place, eatery',
 763: 'revolver, six-gun, six-shooter',
 764: 'rifle',
 765: 'rocking chair, rocker',
 766: 'rotisserie',
 767: 'rubber eraser, rubber, pencil eraser',
 768: 'rugby ball',
 769: 'rule, ruler',
 770: 'running shoe',
 771: 'safe',
 772: 'safety pin',
 773: 'saltshaker, salt shaker',
 774: 'sandal',
 775: 'sarong',
 776: 'sax, saxophone',
 777: 'scabbard',
 778: 'scale, weighing machine',
 779: 'school bus',
 780: 'schooner',
 781: 'scoreboard',
 782: 'screen, CRT screen',
 783: 'screw',
 784: 'screwdriver',
 785: 'seat belt, seatbelt',
 786: 'sewing machine',
 787: 'shield, buckler',
 788: 'shoe shop, shoe-shop, shoe store',
 789: 'shoji',
 790: 'shopping basket',
 791: 'shopping cart',
 792: 'shovel',
 793: 'shower cap',
 794: 'shower curtain',
 795: 'ski',
 796: 'ski mask',
 797: 'sleeping bag',
 798: 'slide rule, slipstick',
 799: 'sliding door',
 800: 'slot, one-armed bandit',
 801: 'snorkel',
 802: 'snowmobile',
 803: 'snowplow, snowplough',
 804: 'soap dispenser',
 805: 'soccer ball',
 806: 'sock',
 807: 'solar dish, solar collector, solar furnace',
 808: 'sombrero',
 809: 'soup bowl',
 810: 'space bar',
 811: 'space heater',
 812: 'space shuttle',
 813: 'spatula',
 814: 'speedboat',
 815: "spider web, spider's web",
 816: 'spindle',
 817: 'sports car, sport car',
 818: 'spotlight, spot',
 819: 'stage',
 820: 'steam locomotive',
 821: 'steel arch bridge',
 822: 'steel drum',
 823: 'stethoscope',
 824: 'stole',
 825: 'stone wall',
 826: 'stopwatch, stop watch',
 827: 'stove',
 828: 'strainer',
 829: 'streetcar, tram, tramcar, trolley, trolley car',
 830: 'stretcher',
 831: 'studio couch, day bed',
 832: 'stupa, tope',
 833: 'submarine, pigboat, sub, U-boat',
 834: 'suit, suit of clothes',
 835: 'sundial',
 836: 'sunglass',
 837: 'sunglasses, dark glasses, shades',
 838: 'sunscreen, sunblock, sun blocker',
 839: 'suspension bridge',
 840: 'swab, swob, mop',
 841: 'sweatshirt',
 842: 'swimming trunks, bathing trunks',
 843: 'swing',
 844: 'switch, electric switch, electrical switch',
 845: 'syringe',
 846: 'table lamp',
 847: 'tank, army tank, armored combat vehicle, armoured combat vehicle',
 848: 'tape player',
 849: 'teapot',
 850: 'teddy, teddy bear',
 851: 'television, television system',
 852: 'tennis ball',
 853: 'thatch, thatched roof',
 854: 'theater curtain, theatre curtain',
 855: 'thimble',
 856: 'thresher, thrasher, threshing machine',
 857: 'throne',
 858: 'tile roof',
 859: 'toaster',
 860: 'tobacco shop, tobacconist shop, tobacconist',
 861: 'toilet seat',
 862: 'torch',
 863: 'totem pole',
 864: 'tow truck, tow car, wrecker',
 865: 'toyshop',
 866: 'tractor',
 867: 'trailer truck, tractor trailer, trucking rig, rig, articulated lorry, semi',
 868: 'tray',
 869: 'trench coat',
 870: 'tricycle, trike, velocipede',
 871: 'trimaran',
 872: 'tripod',
 873: 'triumphal arch',
 874: 'trolleybus, trolley coach, trackless trolley',
 875: 'trombone',
 876: 'tub, vat',
 877: 'turnstile',
 878: 'typewriter keyboard',
 879: 'umbrella',
 880: 'unicycle, monocycle',
 881: 'upright, upright piano',
 882: 'vacuum, vacuum cleaner',
 883: 'vase',
 884: 'vault',
 885: 'velvet',
 886: 'vending machine',
 887: 'vestment',
 888: 'viaduct',
 889: 'violin, fiddle',
 890: 'volleyball',
 891: 'waffle iron',
 892: 'wall clock',
 893: 'wallet, billfold, notecase, pocketbook',
 894: 'wardrobe, closet, press',
 895: 'warplane, military plane',
 896: 'washbasin, handbasin, washbowl, lavabo, wash-hand basin',
 897: 'washer, automatic washer, washing machine',
 898: 'water bottle',
 899: 'water jug',
 900: 'water tower',
 901: 'whiskey jug',
 902: 'whistle',
 903: 'wig',
 904: 'window screen',
 905: 'window shade',
 906: 'Windsor tie',
 907: 'wine bottle',
 908: 'wing',
 909: 'wok',
 910: 'wooden spoon',
 911: 'wool, woolen, woollen',
 912: 'worm fence, snake fence, snake-rail fence, Virginia fence',
 913: 'wreck',
 914: 'yawl',
 915: 'yurt',
 916: 'web site, website, internet site, site',
 917: 'comic book',
 918: 'crossword puzzle, crossword',
 919: 'street sign',
 920: 'traffic light, traffic signal, stoplight',
 921: 'book jacket, dust cover, dust jacket, dust wrapper',
 922: 'menu',
 923: 'plate',
 924: 'guacamole',
 925: 'consomme',
 926: 'hot pot, hotpot',
 927: 'trifle',
 928: 'ice cream, icecream',
 929: 'ice lolly, lolly, lollipop, popsicle',
 930: 'French loaf',
 931: 'bagel, beigel',
 932: 'pretzel',
 933: 'cheeseburger',
 934: 'hotdog, hot dog, red hot',
 935: 'mashed potato',
 936: 'head cabbage',
 937: 'broccoli',
 938: 'cauliflower',
 939: 'zucchini, courgette',
 940: 'spaghetti squash',
 941: 'acorn squash',
 942: 'butternut squash',
 943: 'cucumber, cuke',
 944: 'artichoke, globe artichoke',
 945: 'bell pepper',
 946: 'cardoon',
 947: 'mushroom',
 948: 'Granny Smith',
 949: 'strawberry',
 950: 'orange',
 951: 'lemon',
 952: 'fig',
 953: 'pineapple, ananas',
 954: 'banana',
 955: 'jackfruit, jak, jack',
 956: 'custard apple',
 957: 'pomegranate',
 958: 'hay',
 959: 'carbonara',
 960: 'chocolate sauce, chocolate syrup',
 961: 'dough',
 962: 'meat loaf, meatloaf',
 963: 'pizza, pizza pie',
 964: 'potpie',
 965: 'burrito',
 966: 'red wine',
 967: 'espresso',
 968: 'cup',
 969: 'eggnog',
 970: 'alp',
 971: 'bubble',
 972: 'cliff, drop, drop-off',
 973: 'coral reef',
 974: 'geyser',
 975: 'lakeside, lakeshore',
 976: 'promontory, headland, head, foreland',
 977: 'sandbar, sand bar',
 978: 'seashore, coast, seacoast, sea-coast',
 979: 'valley, vale',
 980: 'volcano',
 981: 'ballplayer, baseball player',
 982: 'groom, bridegroom',
 983: 'scuba diver',
 984: 'rapeseed',
 985: 'daisy',
 986: "yellow lady's slipper, yellow lady-slipper, Cypripedium calceolus, Cypripedium parviflorum",
 987: 'corn',
 988: 'acorn',
 989: 'hip, rose hip, rosehip',
 990: 'buckeye, horse chestnut, conker',
 991: 'coral fungus',
 992: 'agaric',
 993: 'gyromitra',
 994: 'stinkhorn, carrion fungus',
 995: 'earthstar',
 996: 'hen-of-the-woods, hen of the woods, Polyporus frondosus, Grifola frondosa',
 997: 'bolete',
 998: 'ear, spike, capitulum',
 999: 'toilet tissue, toilet paper, bathroom tissue'}

def dog_detector(img_path):
    ## TODO: Complete the function.
    if VGG16_predict(img_path) in range(151, 269):
        return True # true/false
    else:
        return False

dog_detector('images/Labrador_retriever_06457.jpg')

True

(IMPLEMENTATION) Assess the Dog Detector

Question 2: Use the code cell below to test the performance of your dog_detector function.

• What percentage of the images in human_files_short have a detected dog?
• What percentage of the images in dog_files_short have a detected dog?

Answer:

detected_human = 0
detected_dog = 0

for n in human_files_short:
    if dog_detector(n):
        detected_human += 1
for n in dog_files_short:
    if dog_detector(n):
        detected_dog += 1 
print('Human face detection accuracy: {0}%'.format((detected_human/len(human_files_short)*100)))
print('Dog face detection accuracy: {0}%'.format((detected_dog/len(dog_files_short)*100)))

Human face detection accuracy: 0.0%
Dog face detection accuracy: 94.0%

We suggest VGG-16 as a potential network to detect dog images in your algorithm, but you are free to explore other pre-trained networks (such as Inception-v3, ResNet-50, etc). Please use the code cell below to test other pre-trained PyTorch models. If you decide to pursue this optional task, report performance on human_files_short and dog_files_short.

### (Optional) 
### TODO: Report the performance of another pre-trained network.
### Feel free to use as many code cells as needed.

---

Step 3: Create a CNN to Classify Dog Breeds (from Scratch)

Now that we have functions for detecting humans and dogs in images, we need a way to predict breed from images. In this step, you will create a CNN that classifies dog breeds. You must create your CNN from scratch (so, you can't use transfer learning yet!), and you must attain a test accuracy of at least 10%. In Step 4 of this notebook, you will have the opportunity to use transfer learning to create a CNN that attains greatly improved accuracy.

We mention that the task of assigning breed to dogs from images is considered exceptionally challenging. To see why, consider that even a human would have trouble distinguishing between a Brittany and a Welsh Springer Spaniel.

Brittany	Welsh Springer Spaniel

It is not difficult to find other dog breed pairs with minimal inter-class variation (for instance, Curly-Coated Retrievers and American Water Spaniels).

Curly-Coated Retriever	American Water Spaniel

Likewise, recall that labradors come in yellow, chocolate, and black. Your vision-based algorithm will have to conquer this high intra-class variation to determine how to classify all of these different shades as the same breed.

Yellow Labrador	Chocolate Labrador	Black Labrador

We also mention that random chance presents an exceptionally low bar: setting aside the fact that the classes are slightly imabalanced, a random guess will provide a correct answer roughly 1 in 133 times, which corresponds to an accuracy of less than 1%.

Remember that the practice is far ahead of the theory in deep learning. Experiment with many different architectures, and trust your intuition. And, of course, have fun!

(IMPLEMENTATION) Specify Data Loaders for the Dog Dataset

Use the code cell below to write three separate data loaders for the training, validation, and test datasets of dog images (located at dog_images/train, dog_images/valid, and dog_images/test, respectively). You may find this documentation on custom datasets to be a useful resource. If you are interested in augmenting your training and/or validation data, check out the wide variety of transforms!

import os
from torchvision import datasets
import torchvision.transforms as transforms
import torch
from PIL import ImageFile
ImageFile.LOAD_TRUNCATED_IMAGES = True

### TODO: Write data loaders for training, validation, and test sets
## Specify appropriate transforms, and batch_sizes
transformations = {
    'train': transforms.Compose([transforms.RandomResizedCrop(224),
             transforms.RandomHorizontalFlip(),
             transforms.ToTensor(),
             transforms.Normalize(mean=[0.485, 0.456, 0.406],
                                  std=[0.229, 0.224, 0.225]),
             ]),

    'valid': transforms.Compose([transforms.Resize(256),
                                transforms.CenterCrop(224),
             transforms.ToTensor(),
             transforms.Normalize(mean=[0.485, 0.456, 0.406],
                                  std=[0.229, 0.224, 0.225]),
             ]),


    'test': transforms.Compose([transforms.Resize(size=(224,224)),
             transforms.ToTensor(),
             transforms.Normalize(mean=[0.485, 0.456, 0.406],
                                  std=[0.229, 0.224, 0.225]),
             ])

}

data_transforms = {'train': transforms.Compose([transforms.RandomResizedCrop(224),
                                     transforms.RandomHorizontalFlip(),
                                     transforms.ToTensor(),
                                     transforms.Normalize(mean=[0.485, 0.456, 0.406],
                                          std=[0.229, 0.224, 0.225])]),
                   'valid': transforms.Compose([transforms.Resize(256),
                                     transforms.CenterCrop(224),
                                     transforms.ToTensor(),
                                     transforms.Normalize(mean=[0.485, 0.456, 0.406],
                                          std=[0.229, 0.224, 0.225])]),
                   'test': transforms.Compose([transforms.Resize(size=(224,224)),
                                     transforms.ToTensor(), 
                                     transforms.Normalize(mean=[0.485, 0.456, 0.406],
                                          std=[0.229, 0.224, 0.225])])
                  }

batch_size = 20
train_data = datasets.ImageFolder('dogImages/train', transform=transformations['train'])

train_loader = torch.utils.data.DataLoader(datasets.ImageFolder('dogImages/train', transform=data_transforms['train']),
                                          batch_size=batch_size,
                                          shuffle=True,
                                          num_workers=0)
valid_loader = torch.utils.data.DataLoader(datasets.ImageFolder('dogImages/valid', transform=data_transforms['valid']),
                                          batch_size=batch_size,
                                          shuffle=False,
                                          num_workers=0)
test_loader = torch.utils.data.DataLoader(datasets.ImageFolder('dogImages/test', transform=data_transforms['test']),
                                          batch_size=batch_size,
                                          shuffle=False,
                                          num_workers=0)

loaders_scratch = {'train': train_loader, 'valid': valid_loader, 'test': test_loader}
num_classes = len(train_data.classes)
print("Number of classes {}".format(num_classes))

Number of classes 133

from torchvision import utils

def visualize_sample_images(inp):
    print(inp.shape)
    inp = inp.numpy().transpose((1, 2, 0))
    inp = inp * np.array((0.229, 0.224, 0.225)) + np.array((0.485, 0.456, 0.406))
    inp = np.clip(inp, 0, 1)
    
    fig = plt.figure(figsize=(60, 25))
    plt.axis('off')
    plt.imshow(inp)
    plt.pause(0.001)
    
# Get a batch of training data.    
inputs, classes = next(iter(loaders_scratch['train']))

# Convert the batch to a grid.
grid = utils.make_grid(inputs, nrow=5)

# Display!
visualize_sample_images(grid)

torch.Size([3, 906, 1132])

Question 3: Describe your chosen procedure for preprocessing the data.

• How does your code resize the images (by cropping, stretching, etc)? What size did you pick for the input tensor, and why?
• Did you decide to augment the dataset? If so, how (through translations, flips, rotations, etc)? If not, why not?

Answer: The loader, crops, rotates and flips the images.

(IMPLEMENTATION) Model Architecture

Create a CNN to classify dog breed. Use the template in the code cell below.

import torch.nn as nn
import torch.nn.functional as F

# define the CNN architecture
class Net(nn.Module):
    def __init__(self):
        super(Net, self).__init__()
        ## Define layers of a CNN
        self.conv1 = nn.Conv2d(3, 32, 3, stride=2, padding=1)
        self.conv2 = nn.Conv2d(32, 64, 3, stride=2, padding=1)
        self.conv3 = nn.Conv2d(64, 128, 3, padding=1)
        
        self.pool = nn.MaxPool2d(2, 2)
        self.fc1 = nn.Linear(7*7*128, 480)
        self.fc2 = nn.Linear(480, num_classes)
        
        
    def forward(self, x):
        # add sequence of convolutional and max pooling layers
        x = self.pool(F.relu(self.conv1(x)))
        x = self.pool(F.relu(self.conv2(x)))
        x = self.pool(F.relu(self.conv3(x)))
        
        x = x.view(x.size(0), -1)
        
        x = F.dropout(x, p=0.30)
        x = F.relu(self.fc1(x))
        x = F.dropout(x, p=0.30)
        x = self.fc2(x)
        return x

#-#-# You so NOT have to modify the code below this line. #-#-#

# instantiate the CNN
model_scratch = Net()
print(model_scratch)
# move tensors to GPU if CUDA is available
if use_cuda:
    model_scratch.cuda()

Net(
  (conv1): Conv2d(3, 32, kernel_size=(3, 3), stride=(2, 2), padding=(1, 1))
  (conv2): Conv2d(32, 64, kernel_size=(3, 3), stride=(2, 2), padding=(1, 1))
  (conv3): Conv2d(64, 128, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))
  (pool): MaxPool2d(kernel_size=2, stride=2, padding=0, dilation=1, ceil_mode=False)
  (fc1): Linear(in_features=6272, out_features=480, bias=True)
  (fc2): Linear(in_features=480, out_features=133, bias=True)
)

Question 4: Outline the steps you took to get to your final CNN architecture and your reasoning at each step.

Answer: Started off by copying the content from the CIFAR 10 exercise we did in a previous lesson. Then proceeded with some tweaks. The neural network architecure has been the same, 3 Cov2d layers, 1 Hidden Linear and 1 Output linear layer. Did not apply MaxPooling to every Conv2d layer output at first, same with Dropout. After a few tests added them both in between all layers, this, to achieve a higher accuracy. Stride for the Conv2d layers was picked based on the size of the image to be processed, didn't feel the need to change the kernel size

(IMPLEMENTATION) Specify Loss Function and Optimizer

Use the next code cell to specify a loss function and optimizer. Save the chosen loss function as criterion_scratch, and the optimizer as optimizer_scratch below.

import torch.optim as optim

### TODO: select loss function
criterion_scratch = nn.CrossEntropyLoss()

### TODO: select optimizer
optimizer_scratch = optim.SGD(model_scratch.parameters(), lr=0.05)

(IMPLEMENTATION) Train and Validate the Model

Train and validate your model in the code cell below. Save the final model parameters at filepath 'model_scratch.pt'.

def train(n_epochs, loaders, model, optimizer, criterion, use_cuda, save_path, last_validation_loss=None):
    """returns trained model"""
    # initialize tracker for minimum validation loss
    if last_validation_loss is not None:
        valid_loss_min = last_validation_loss
    else:
        valid_loss_min = np.Inf
    
    for epoch in range(1, n_epochs+1):
        # initialize variables to monitor training and validation loss
        train_loss = 0.0
        valid_loss = 0.0
        
        ###################
        # train the model #
        ###################
        model.train()
        for batch_idx, (data, target) in enumerate(loaders['train']):
            # move to GPU
            if use_cuda:
                data, target = data.cuda(), target.cuda()
            ## find the loss and update the model parameters accordingly
            ## record the average training loss, using something like
            ## train_loss = train_loss + ((1 / (batch_idx + 1)) * (loss.data - train_loss))

            # initialize weights to zero
            optimizer.zero_grad()
            
            output = model(data)
            
            # calculate loss
            loss = criterion(output, target)
            
            # back prop
            loss.backward()
            
            # grad
            optimizer.step()
            
            train_loss = train_loss + ((1 / (batch_idx + 1)) * (loss.data - train_loss))
            
            if batch_idx % 100 == 0:
                print('Epoch %d, Batch %d loss: %.6f' %
                  (epoch, batch_idx + 1, train_loss))
            
        ######################    
        # validate the model #
        ######################
        model.eval()
        for batch_idx, (data, target) in enumerate(loaders['valid']):
            # move to GPU
            if use_cuda:
                data, target = data.cuda(), target.cuda()
            ## update the average validation loss
            output = model(data)
            loss = criterion(output, target)
            valid_loss = valid_loss + ((1 / (batch_idx + 1)) * (loss.data - valid_loss))

            
        # print training/validation statistics 
        print('Epoch: {} \tTraining Loss: {:.6f} \tValidation Loss: {:.6f}'.format(
            epoch, 
            train_loss,
            valid_loss
            ))
        
        ## TODO: save the model if validation loss has decreased
        if valid_loss < valid_loss_min:
            torch.save(model.state_dict(), save_path)
            print('Validation loss decreased ({:.6f} --> {:.6f}).  Saving model ...'.format(
            valid_loss_min,
            valid_loss))
            valid_loss_min = valid_loss
            
    # return trained model
    return model
device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")


# train the model
model_scratch = train(13, loaders_scratch, model_scratch, optimizer_scratch, 
                      criterion_scratch, use_cuda, 'model_scratch.pt')

Epoch 1, Batch 1 loss: 4.891463
Epoch 1, Batch 101 loss: 4.887191
Epoch 1, Batch 201 loss: 4.881242
Epoch 1, Batch 301 loss: 4.872961
Epoch: 1 	Training Loss: 4.868426 	Validation Loss: 4.828179
Validation loss decreased (inf --> 4.828179).  Saving model ...
Epoch 2, Batch 1 loss: 4.853792
Epoch 2, Batch 101 loss: 4.800513
Epoch 2, Batch 201 loss: 4.790209
Epoch 2, Batch 301 loss: 4.777029
Epoch: 2 	Training Loss: 4.766178 	Validation Loss: 4.614305
Validation loss decreased (4.828179 --> 4.614305).  Saving model ...
Epoch 3, Batch 1 loss: 4.647774
Epoch 3, Batch 101 loss: 4.657810
Epoch 3, Batch 201 loss: 4.646612
Epoch 3, Batch 301 loss: 4.632226
Epoch: 3 	Training Loss: 4.631553 	Validation Loss: 4.498662
Validation loss decreased (4.614305 --> 4.498662).  Saving model ...
Epoch 4, Batch 1 loss: 4.336759
Epoch 4, Batch 101 loss: 4.580102
Epoch 4, Batch 201 loss: 4.568077
Epoch 4, Batch 301 loss: 4.563508
Epoch: 4 	Training Loss: 4.560485 	Validation Loss: 4.403653
Validation loss decreased (4.498662 --> 4.403653).  Saving model ...
Epoch 5, Batch 1 loss: 4.838805
Epoch 5, Batch 101 loss: 4.537012
Epoch 5, Batch 201 loss: 4.518424
Epoch 5, Batch 301 loss: 4.515185
Epoch: 5 	Training Loss: 4.506819 	Validation Loss: 4.353162
Validation loss decreased (4.403653 --> 4.353162).  Saving model ...
Epoch 6, Batch 1 loss: 4.213020
Epoch 6, Batch 101 loss: 4.467597
Epoch 6, Batch 201 loss: 4.435124
Epoch 6, Batch 301 loss: 4.439794
Epoch: 6 	Training Loss: 4.440784 	Validation Loss: 4.266809
Validation loss decreased (4.353162 --> 4.266809).  Saving model ...
Epoch 7, Batch 1 loss: 4.259788
Epoch 7, Batch 101 loss: 4.386454
Epoch 7, Batch 201 loss: 4.390060
Epoch 7, Batch 301 loss: 4.400233
Epoch: 7 	Training Loss: 4.401446 	Validation Loss: 4.358095
Epoch 8, Batch 1 loss: 4.287869
Epoch 8, Batch 101 loss: 4.328768
Epoch 8, Batch 201 loss: 4.334605
Epoch 8, Batch 301 loss: 4.338391
Epoch: 8 	Training Loss: 4.332090 	Validation Loss: 4.139180
Validation loss decreased (4.266809 --> 4.139180).  Saving model ...
Epoch 9, Batch 1 loss: 3.930563
Epoch 9, Batch 101 loss: 4.280467
Epoch 9, Batch 201 loss: 4.283848
Epoch 9, Batch 301 loss: 4.275363
Epoch: 9 	Training Loss: 4.272834 	Validation Loss: 4.045688
Validation loss decreased (4.139180 --> 4.045688).  Saving model ...
Epoch 10, Batch 1 loss: 4.226456
Epoch 10, Batch 101 loss: 4.197971
Epoch 10, Batch 201 loss: 4.223069
Epoch 10, Batch 301 loss: 4.218376
Epoch: 10 	Training Loss: 4.218310 	Validation Loss: 4.094007
Epoch 11, Batch 1 loss: 4.573969
Epoch 11, Batch 101 loss: 4.157094
Epoch 11, Batch 201 loss: 4.148064
Epoch 11, Batch 301 loss: 4.139951
Epoch: 11 	Training Loss: 4.143905 	Validation Loss: 4.197736
Epoch 12, Batch 1 loss: 4.277923
Epoch 12, Batch 101 loss: 4.098723
Epoch 12, Batch 201 loss: 4.114862
Epoch 12, Batch 301 loss: 4.107683
Epoch: 12 	Training Loss: 4.103392 	Validation Loss: 3.934338
Validation loss decreased (4.045688 --> 3.934338).  Saving model ...
Epoch 13, Batch 1 loss: 3.970747
Epoch 13, Batch 101 loss: 4.070986
Epoch 13, Batch 201 loss: 4.061718
Epoch 13, Batch 301 loss: 4.058563
Epoch: 13 	Training Loss: 4.064753 	Validation Loss: 3.933906
Validation loss decreased (3.934338 --> 3.933906).  Saving model ...

# load the model that got the best validation accuracy
model_scratch.load_state_dict(torch.load('model_scratch.pt'))

<All keys matched successfully>

(IMPLEMENTATION) Test the Model

Try out your model on the test dataset of dog images. Use the code cell below to calculate and print the test loss and accuracy. Ensure that your test accuracy is greater than 10%.

def test(loaders, model, criterion, use_cuda):

    # monitor test loss and accuracy
    test_loss = 0.
    correct = 0.
    total = 0.

    for batch_idx, (data, target) in enumerate(loaders['test']):
        # move to GPU
        if use_cuda:
            data, target = data.cuda(), target.cuda()
        # forward pass: compute predicted outputs by passing inputs to the model
        output = model(data)
        # calculate the loss
        loss = criterion(output, target)
        # update average test loss 
        test_loss = test_loss + ((1 / (batch_idx + 1)) * (loss.data - test_loss))
        # convert output probabilities to predicted class
        pred = output.data.max(1, keepdim=True)[1]
        # compare predictions to true label
        correct += np.sum(np.squeeze(pred.eq(target.data.view_as(pred))).cpu().numpy())
        total += data.size(0)
            
    print('Test Loss: {:.6f}\n'.format(test_loss))

    print('\nTest Accuracy: %2d%% (%2d/%2d)' % (
        100. * correct / total, correct, total))

# call test function    
test(loaders_scratch, model_scratch, criterion_scratch, use_cuda)

Test Loss: 4.009884


Test Accuracy: 10% (85/836)

---

Step 4: Create a CNN to Classify Dog Breeds (using Transfer Learning)

You will now use transfer learning to create a CNN that can identify dog breed from images. Your CNN must attain at least 60% accuracy on the test set.

(IMPLEMENTATION) Specify Data Loaders for the Dog Dataset

Use the code cell below to write three separate data loaders for the training, validation, and test datasets of dog images (located at dogImages/train, dogImages/valid, and dogImages/test, respectively).

If you like, you are welcome to use the same data loaders from the previous step, when you created a CNN from scratch.

## TODO: Specify data loaders
loaders_transfer = dict(train=loaders_scratch['train'], test=loaders_scratch['test'], valid=loaders_scratch['valid'])

(IMPLEMENTATION) Model Architecture

Use transfer learning to create a CNN to classify dog breed. Use the code cell below, and save your initialized model as the variable model_transfer.

import torchvision.models as models
import torch.nn as nn

## TODO: Specify model architecture 

model_transfer = models.resnet50(pretrained=True)

# check if CUDA is available
use_cuda = torch.cuda.is_available()
    
# stop gradient updates
for param in model_transfer.parameters():
    param.requires_grad = False
    
# last output layer is our classifier
model_transfer.fc = nn.Linear(2048, 133, bias=True)
# enable gradient updates for the last layer 
for param in model_transfer.fc.parameters():
    param.requires_grad = True
    

if use_cuda:
    model_transfer = model_transfer.cuda()
print(model_transfer)

Downloading: "https://download.pytorch.org/models/resnet50-19c8e357.pth" to C:\Users\z/.cache\torch\hub\checkpoints\resnet50-19c8e357.pth

ResNet(
  (conv1): Conv2d(3, 64, kernel_size=(7, 7), stride=(2, 2), padding=(3, 3), bias=False)
  (bn1): BatchNorm2d(64, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
  (relu): ReLU(inplace=True)
  (maxpool): MaxPool2d(kernel_size=3, stride=2, padding=1, dilation=1, ceil_mode=False)
  (layer1): Sequential(
    (0): Bottleneck(
      (conv1): Conv2d(64, 64, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn1): BatchNorm2d(64, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv2): Conv2d(64, 64, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
      (bn2): BatchNorm2d(64, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv3): Conv2d(64, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn3): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (relu): ReLU(inplace=True)
      (downsample): Sequential(
        (0): Conv2d(64, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
        (1): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      )
    )
    (1): Bottleneck(
      (conv1): Conv2d(256, 64, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn1): BatchNorm2d(64, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv2): Conv2d(64, 64, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
      (bn2): BatchNorm2d(64, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv3): Conv2d(64, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn3): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (relu): ReLU(inplace=True)
    )
    (2): Bottleneck(
      (conv1): Conv2d(256, 64, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn1): BatchNorm2d(64, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv2): Conv2d(64, 64, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
      (bn2): BatchNorm2d(64, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv3): Conv2d(64, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn3): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (relu): ReLU(inplace=True)
    )
  )
  (layer2): Sequential(
    (0): Bottleneck(
      (conv1): Conv2d(256, 128, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn1): BatchNorm2d(128, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv2): Conv2d(128, 128, kernel_size=(3, 3), stride=(2, 2), padding=(1, 1), bias=False)
      (bn2): BatchNorm2d(128, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv3): Conv2d(128, 512, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn3): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (relu): ReLU(inplace=True)
      (downsample): Sequential(
        (0): Conv2d(256, 512, kernel_size=(1, 1), stride=(2, 2), bias=False)
        (1): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      )
    )
    (1): Bottleneck(
      (conv1): Conv2d(512, 128, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn1): BatchNorm2d(128, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv2): Conv2d(128, 128, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
      (bn2): BatchNorm2d(128, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv3): Conv2d(128, 512, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn3): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (relu): ReLU(inplace=True)
    )
    (2): Bottleneck(
      (conv1): Conv2d(512, 128, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn1): BatchNorm2d(128, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv2): Conv2d(128, 128, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
      (bn2): BatchNorm2d(128, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv3): Conv2d(128, 512, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn3): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (relu): ReLU(inplace=True)
    )
    (3): Bottleneck(
      (conv1): Conv2d(512, 128, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn1): BatchNorm2d(128, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv2): Conv2d(128, 128, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
      (bn2): BatchNorm2d(128, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv3): Conv2d(128, 512, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn3): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (relu): ReLU(inplace=True)
    )
  )
  (layer3): Sequential(
    (0): Bottleneck(
      (conv1): Conv2d(512, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn1): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv2): Conv2d(256, 256, kernel_size=(3, 3), stride=(2, 2), padding=(1, 1), bias=False)
      (bn2): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv3): Conv2d(256, 1024, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn3): BatchNorm2d(1024, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (relu): ReLU(inplace=True)
      (downsample): Sequential(
        (0): Conv2d(512, 1024, kernel_size=(1, 1), stride=(2, 2), bias=False)
        (1): BatchNorm2d(1024, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      )
    )
    (1): Bottleneck(
      (conv1): Conv2d(1024, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn1): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv2): Conv2d(256, 256, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
      (bn2): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv3): Conv2d(256, 1024, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn3): BatchNorm2d(1024, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (relu): ReLU(inplace=True)
    )
    (2): Bottleneck(
      (conv1): Conv2d(1024, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn1): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv2): Conv2d(256, 256, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
      (bn2): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv3): Conv2d(256, 1024, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn3): BatchNorm2d(1024, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (relu): ReLU(inplace=True)
    )
    (3): Bottleneck(
      (conv1): Conv2d(1024, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn1): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv2): Conv2d(256, 256, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
      (bn2): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv3): Conv2d(256, 1024, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn3): BatchNorm2d(1024, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (relu): ReLU(inplace=True)
    )
    (4): Bottleneck(
      (conv1): Conv2d(1024, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn1): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv2): Conv2d(256, 256, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
      (bn2): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv3): Conv2d(256, 1024, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn3): BatchNorm2d(1024, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (relu): ReLU(inplace=True)
    )
    (5): Bottleneck(
      (conv1): Conv2d(1024, 256, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn1): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv2): Conv2d(256, 256, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
      (bn2): BatchNorm2d(256, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv3): Conv2d(256, 1024, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn3): BatchNorm2d(1024, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (relu): ReLU(inplace=True)
    )
  )
  (layer4): Sequential(
    (0): Bottleneck(
      (conv1): Conv2d(1024, 512, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn1): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv2): Conv2d(512, 512, kernel_size=(3, 3), stride=(2, 2), padding=(1, 1), bias=False)
      (bn2): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv3): Conv2d(512, 2048, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn3): BatchNorm2d(2048, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (relu): ReLU(inplace=True)
      (downsample): Sequential(
        (0): Conv2d(1024, 2048, kernel_size=(1, 1), stride=(2, 2), bias=False)
        (1): BatchNorm2d(2048, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      )
    )
    (1): Bottleneck(
      (conv1): Conv2d(2048, 512, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn1): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv2): Conv2d(512, 512, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
      (bn2): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv3): Conv2d(512, 2048, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn3): BatchNorm2d(2048, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (relu): ReLU(inplace=True)
    )
    (2): Bottleneck(
      (conv1): Conv2d(2048, 512, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn1): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv2): Conv2d(512, 512, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1), bias=False)
      (bn2): BatchNorm2d(512, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (conv3): Conv2d(512, 2048, kernel_size=(1, 1), stride=(1, 1), bias=False)
      (bn3): BatchNorm2d(2048, eps=1e-05, momentum=0.1, affine=True, track_running_stats=True)
      (relu): ReLU(inplace=True)
    )
  )
  (avgpool): AdaptiveAvgPool2d(output_size=(1, 1))
  (fc): Linear(in_features=2048, out_features=133, bias=True)
)

Question 5: Outline the steps you took to get to your final CNN architecture and your reasoning at each step. Describe why you think the architecture is suitable for the current problem.

Answer: The dataset has many images filled with noise, so I chose ResNet because its one of the most widely used for Image Classification, I think it does an excellent job at generailizing without being impacted too much by noise. I also believe its a great transfer learning model because it was trained to classify a huge number of classes, with its 50 layers it is able to pick up even the most subtle patterns

(IMPLEMENTATION) Specify Loss Function and Optimizer

Use the next code cell to specify a loss function and optimizer. Save the chosen loss function as criterion_transfer, and the optimizer as optimizer_transfer below.

import torch.optim as optim

criterion_transfer = nn.CrossEntropyLoss()
optimizer_transfer = optim.SGD(model_transfer.fc.parameters(), lr=0.004, momentum=0.9)

(IMPLEMENTATION) Train and Validate the Model

Train and validate your model in the code cell below. Save the final model parameters at filepath 'model_transfer.pt'.

import numpy as np
def train(n_epochs, loaders, model, optimizer, criterion, use_cuda, save_path):
    """returns trained model"""
    # initialize tracker for minimum validation loss
    valid_loss_min = np.Inf
    
    for epoch in range(1, n_epochs+1):
        # initialize variables to monitor training and validation loss
        train_loss = 0.0
        valid_loss = 0.0
        
        ###################
        # train the model #
        ###################
        model.train()
        for batch_idx, (data, target) in enumerate(loaders['train']):
            # move to GPU
            if use_cuda:
                data, target = data.cuda(), target.cuda()

            # initialize weights to zero
            optimizer.zero_grad()
            
            output = model(data)
            
            # calculate loss
            loss = criterion(output, target)
            
            # back prop
            loss.backward()
            
            # grad
            optimizer.step()
            
            train_loss = train_loss + ((1 / (batch_idx + 1)) * (loss.data - train_loss))
            
            if batch_idx % 100 == 0:
                print('Epoch %d, Batch %d loss: %.6f' %
                  (epoch, batch_idx + 1, train_loss))
        
        ######################    
        # validate the model #
        ######################
        model.eval()
        for batch_idx, (data, target) in enumerate(loaders['valid']):
            # move to GPU
            if use_cuda:
                data, target = data.cuda(), target.cuda()
            ## update the average validation loss
            output = model(data)
            loss = criterion(output, target)
            valid_loss = valid_loss + ((1 / (batch_idx + 1)) * (loss.data - valid_loss))

            
        # print training/validation statistics 
        print('Epoch: {} \tTraining Loss: {:.6f} \tValidation Loss: {:.6f}'.format(
            epoch, 
            train_loss,
            valid_loss
            ))
        
        ## TODO: save the model if validation loss has decreased
        if valid_loss < valid_loss_min:
            torch.save(model.state_dict(), save_path)
            print('Validation loss decreased ({:.6f} --> {:.6f}).  Saving model ...'.format(
            valid_loss_min,
            valid_loss))
            valid_loss_min = valid_loss
            
    # return trained model
    return model

train(20, loaders_transfer, model_transfer, optimizer_transfer, criterion_transfer, use_cuda, 'model_transfer.pt')

Epoch 1, Batch 1 loss: 4.901036
Epoch 1, Batch 101 loss: 4.243362
Epoch 1, Batch 201 loss: 3.523591
Epoch 1, Batch 301 loss: 3.078831
Epoch: 1 	Training Loss: 2.971996 	Validation Loss: 1.134206
Validation loss decreased (inf --> 1.134206).  Saving model ...
Epoch 2, Batch 1 loss: 1.843519
Epoch 2, Batch 101 loss: 1.647637
Epoch 2, Batch 201 loss: 1.546064
Epoch 2, Batch 301 loss: 1.475190
Epoch: 2 	Training Loss: 1.458776 	Validation Loss: 0.702167
Validation loss decreased (1.134206 --> 0.702167).  Saving model ...
Epoch 3, Batch 1 loss: 1.087660
Epoch 3, Batch 101 loss: 1.205051
Epoch 3, Batch 201 loss: 1.198629
Epoch 3, Batch 301 loss: 1.200830
Epoch: 3 	Training Loss: 1.196199 	Validation Loss: 0.586781
Validation loss decreased (0.702167 --> 0.586781).  Saving model ...
Epoch 4, Batch 1 loss: 1.289902
Epoch 4, Batch 101 loss: 1.024093
Epoch 4, Batch 201 loss: 1.044330
Epoch 4, Batch 301 loss: 1.051127
Epoch: 4 	Training Loss: 1.043751 	Validation Loss: 0.541437
Validation loss decreased (0.586781 --> 0.541437).  Saving model ...
Epoch 5, Batch 1 loss: 0.888848
Epoch 5, Batch 101 loss: 1.004983
Epoch 5, Batch 201 loss: 0.965508
Epoch 5, Batch 301 loss: 0.968599
Epoch: 5 	Training Loss: 0.961616 	Validation Loss: 0.504561
Validation loss decreased (0.541437 --> 0.504561).  Saving model ...
Epoch 6, Batch 1 loss: 1.153370
Epoch 6, Batch 101 loss: 0.929357
Epoch 6, Batch 201 loss: 0.923131
Epoch 6, Batch 301 loss: 0.927977
Epoch: 6 	Training Loss: 0.928102 	Validation Loss: 0.449601
Validation loss decreased (0.504561 --> 0.449601).  Saving model ...
Epoch 7, Batch 1 loss: 1.344231
Epoch 7, Batch 101 loss: 0.831767
Epoch 7, Batch 201 loss: 0.856285
Epoch 7, Batch 301 loss: 0.859419
Epoch: 7 	Training Loss: 0.855468 	Validation Loss: 0.447744
Validation loss decreased (0.449601 --> 0.447744).  Saving model ...
Epoch 8, Batch 1 loss: 0.611072
Epoch 8, Batch 101 loss: 0.830151
Epoch 8, Batch 201 loss: 0.854635
Epoch 8, Batch 301 loss: 0.840758
Epoch: 8 	Training Loss: 0.839402 	Validation Loss: 0.439734
Validation loss decreased (0.447744 --> 0.439734).  Saving model ...
Epoch 9, Batch 1 loss: 1.327797
Epoch 9, Batch 101 loss: 0.769152
Epoch 9, Batch 201 loss: 0.787576
Epoch 9, Batch 301 loss: 0.811932
Epoch: 9 	Training Loss: 0.814287 	Validation Loss: 0.434918
Validation loss decreased (0.439734 --> 0.434918).  Saving model ...
Epoch 10, Batch 1 loss: 0.943161
Epoch 10, Batch 101 loss: 0.804858
Epoch 10, Batch 201 loss: 0.794042
Epoch 10, Batch 301 loss: 0.798731
Epoch: 10 	Training Loss: 0.801279 	Validation Loss: 0.410760
Validation loss decreased (0.434918 --> 0.410760).  Saving model ...
Epoch 11, Batch 1 loss: 0.702487
Epoch 11, Batch 101 loss: 0.748414
Epoch 11, Batch 201 loss: 0.748053
Epoch 11, Batch 301 loss: 0.769408
Epoch: 11 	Training Loss: 0.765642 	Validation Loss: 0.385169
Validation loss decreased (0.410760 --> 0.385169).  Saving model ...
Epoch 12, Batch 1 loss: 1.125108
Epoch 12, Batch 101 loss: 0.733287
Epoch 12, Batch 201 loss: 0.751669
Epoch 12, Batch 301 loss: 0.742205
Epoch: 12 	Training Loss: 0.743344 	Validation Loss: 0.391993
Epoch 13, Batch 1 loss: 0.709198
Epoch 13, Batch 101 loss: 0.713678
Epoch 13, Batch 201 loss: 0.730906
Epoch 13, Batch 301 loss: 0.730783

---------------------------------------------------------------------------
KeyboardInterrupt                         Traceback (most recent call last)
<ipython-input-26-8c92aa8a9a3c> in <module>
----> 1 train(20, loaders_transfer, model_transfer, optimizer_transfer, criterion_transfer, use_cuda, 'model_transfer.pt')

<ipython-input-25-64c359533ba2> in train(n_epochs, loaders, model, optimizer, criterion, use_cuda, save_path)
     48                 data, target = data.cuda(), target.cuda()
     49             ## update the average validation loss
---> 50             output = model(data)
     51             loss = criterion(output, target)
     52             valid_loss = valid_loss + ((1 / (batch_idx + 1)) * (loss.data - valid_loss))

E:\Programs\anaconda\envs\deep-learning\lib\site-packages\torch\nn\modules\module.py in _call_impl(self, *input, **kwargs)
    725             result = self._slow_forward(*input, **kwargs)
    726         else:
--> 727             result = self.forward(*input, **kwargs)
    728         for hook in itertools.chain(
    729                 _global_forward_hooks.values(),

E:\Programs\anaconda\envs\deep-learning\lib\site-packages\torchvision\models\resnet.py in forward(self, x)
    158         x = self.layer4(x)
    159 
--> 160         x = self.avgpool(x)
    161         x = x.view(x.size(0), -1)
    162         x = self.fc(x)

E:\Programs\anaconda\envs\deep-learning\lib\site-packages\torch\nn\modules\module.py in __getattr__(self, name)
    764 
    765     def __getattr__(self, name: str) -> Union[Tensor, 'Module']:
--> 766         if '_parameters' in self.__dict__:
    767             _parameters = self.__dict__['_parameters']
    768             if name in _parameters:

KeyboardInterrupt: 

#load the model saved in the checkpoint
import numpy as np
model_transfer.load_state_dict(torch.load('model_transfer.pt'))

<All keys matched successfully>

(IMPLEMENTATION) Test the Model

Try out your model on the test dataset of dog images. Use the code cell below to calculate and print the test loss and accuracy. Ensure that your test accuracy is greater than 60%.

test(loaders_transfer, model_transfer, criterion_transfer, use_cuda)

Test Loss: 0.475210


Test Accuracy: 86% (719/836)

(IMPLEMENTATION) Predict Dog Breed with the Model

Write a function that takes an image path as input and returns the dog breed (Affenpinscher, Afghan hound, etc) that is predicted by your model.

def load_image(img_path):    
    image = Image.open(img_path).convert('RGB')
    prediction_transform = transforms.Compose([transforms.Resize(size=(224, 224)),
                                               transforms.ToTensor(), 
                                               transforms.Normalize(mean=[0.485, 0.456, 0.406],
                                                                    std=[0.229, 0.224, 0.225])])

    # discard the transparent, alpha channel (that's the :3) and add the batch dimension
    image = prediction_transform(image)[:3,:,:].unsqueeze(0)
    return image



### Afunction that takes a path to an image as input
### and returns the dog breed that is predicted by the model.

# list of class names by index, i.e. a name can be accessed like class_names[0]
class_names = [item[4:].replace("_", " ") for item in loaders_transfer['train'].dataset.classes]


def predict_breed_transfer(img_path, model, classes):
    # load the image and return the predicted breed
    img = load_image(img_path)
    model = model.cpu()
    model.eval()
    idx = torch.argmax(model(img))
    return classes[idx]

import os
from PIL import Image
for img_file in os.listdir('./images'):
    img_path = os.path.join('./images', img_file)
    print(img_path)
    pred = predict_breed_transfer(img_path, model_transfer, class_names)
    print("image_file_name: {0}, \t predition breed: {1}".format(img_path, pred))

./images\American_water_spaniel_00648.jpg
image_file_name: ./images\American_water_spaniel_00648.jpg, 	 predition breed: Curly-coated retriever
./images\Brittany_02625.jpg
image_file_name: ./images\Brittany_02625.jpg, 	 predition breed: Brittany
./images\Curly-coated_retriever_03896.jpg
image_file_name: ./images\Curly-coated_retriever_03896.jpg, 	 predition breed: Curly-coated retriever
./images\Labrador_retriever_06449.jpg
image_file_name: ./images\Labrador_retriever_06449.jpg, 	 predition breed: Labrador retriever
./images\Labrador_retriever_06455.jpg
image_file_name: ./images\Labrador_retriever_06455.jpg, 	 predition breed: Labrador retriever
./images\Labrador_retriever_06457.jpg
image_file_name: ./images\Labrador_retriever_06457.jpg, 	 predition breed: Labrador retriever
./images\sample_cnn.png
image_file_name: ./images\sample_cnn.png, 	 predition breed: Pomeranian
./images\sample_dog_output.png
image_file_name: ./images\sample_dog_output.png, 	 predition breed: Great dane
./images\sample_human_output.png
image_file_name: ./images\sample_human_output.png, 	 predition breed: Brussels griffon
./images\Welsh_springer_spaniel_08203.jpg
image_file_name: ./images\Welsh_springer_spaniel_08203.jpg, 	 predition breed: Irish red and white setter

---

Step 5: Write your Algorithm

Write an algorithm that accepts a file path to an image and first determines whether the image contains a human, dog, or neither. Then,

• if a dog is detected in the image, return the predicted breed.
• if a human is detected in the image, return the resembling dog breed.
• if neither is detected in the image, provide output that indicates an error.

You are welcome to write your own functions for detecting humans and dogs in images, but feel free to use the face_detector and human_detector functions developed above. You are required to use your CNN from Step 4 to predict dog breed.

Some sample output for our algorithm is provided below, but feel free to design your own user experience!

(IMPLEMENTATION) Write your Algorithm

def run_app(img_path):
   ## handle cases for a human face, dog, and neither
    if face_detector(img_path):
        print('Hello Human!')
        plt.imshow(Image.open(img_path))
        plt.show()
        print(f'You look like a ... {predict_breed_transfer(img_path, model_transfer, class_names)}')
        print('\n-----------------------------------\n')
    elif dog_detector(img_path):
        print('Its a dog!')
        plt.imshow(Image.open(img_path))
        plt.show()
        print(f'This is a picture of a ... {predict_breed_transfer(img_path, model_transfer, class_names)}')
        print('\n-----------------------------------\n')
    else:
        plt.imshow(Image.open(img_path))
        plt.show()
        print('Sorry, I did not detect a human or a dog in this image.')
        print('\n-----------------------------------\n')

# Load custom test images
human_files = np.array(glob("./test_images/human/*"))
dog_files = np.array(glob("./test_images/dogs/*"))

# print number of images in each dataset
print('There are %d total human images.' % len(human_files))
print('There are %d total dog images.' % len(dog_files))

There are 4 total human images.
There are 6 total dog images.

---

Step 6: Test Your Algorithm

In this section, you will take your new algorithm for a spin! What kind of dog does the algorithm think that you look like? If you have a dog, does it predict your dog's breed accurately? If you have a cat, does it mistakenly think that your cat is a dog?

(IMPLEMENTATION) Test Your Algorithm on Sample Images!

Test your algorithm at least six images on your computer. Feel free to use any images you like. Use at least two human and two dog images.

Question 6: Is the output better than you expected :) ? Or worse :( ? Provide at least three possible points of improvement for your algorithm.

Answer:

The output is a LOT better, transfer learning is mind blowingly effective.

1.-I believe most of the improvements would be made by cleaning up the dataset, as it contains lots of images that do not focus on a dog's face or has random parts of a dog's body. Also obtaining new pictures

2.- Modifying the hyper parameters would allow a higher accuracy

3.- Better data augmentation would help, tried to install a more recent version of pytorch and torchvision to use the filters included in the transforms package, with no success. But i believe it would help improve the model

## TODO: Execute your algorithm from Step 6 on
## at least 6 images on your computer.
## Feel free to use as many code cells as needed.

## suggested code, below
for file in np.hstack((human_files[:100], dog_files[:100])):
    run_app(file)

Sorry, I did not detect a human or a dog in this image.

-----------------------------------

Hello Human!

You look like a ... German pinscher

-----------------------------------

Hello Human!

You look like a ... Wirehaired pointing griffon

-----------------------------------

Hello Human!

You look like a ... German pinscher

-----------------------------------

Its a dog!

This is a picture of a ... Cane corso

-----------------------------------

Its a dog!

This is a picture of a ... Bull terrier

-----------------------------------

Its a dog!

This is a picture of a ... Greyhound

-----------------------------------

Hello Human!

You look like a ... Golden retriever

-----------------------------------

Sorry, I did not detect a human or a dog in this image.

-----------------------------------

Its a dog!

This is a picture of a ... Parson russell terrier

-----------------------------------